CN1700374A - In-situ polymerization method for preparing rare earth permanent magnetic alloy polymer composite magnetic body - Google Patents
In-situ polymerization method for preparing rare earth permanent magnetic alloy polymer composite magnetic body Download PDFInfo
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Abstract
This invention relates to rare earth permanent polymer compound polymer process method, which comprises the following steps: adopting vacuum deposition technique to deposit one layer of poly-p-xylene film on the permanent alloy gold powder; then adding the rare earth permanent alloy magnetic powder into the polymer monomer liquid to process the suspension; using the polymer reaction technique to generate the polymer as adhesive agent in magnetic surface and evenly covering the polymer layer on the magnetic particles; then using the double screw or single screw to extruder to shape the adhesive agent.
Description
Technical field
The present invention relates to magnet forming processing technology field, specifically be meant the in-situ polymerization method for preparing of rare earth permanent magnetic alloy polymer composite magnetic body.
Background technology
Bonded permanent magnet is with magnetic and resin or macromolecular material is mixing or with the magnetic coating, with die pressing, injection moulding, rolling process and extrusion molding etc. it is prepared into final size and shape then, makes after solidifying.Because will contain the binding agent of some in the bonded permanent magnet, these binding agents are nonmagnetic substance, thus the density of bonded permanent magnet low than sintered magnet, thus its magnetic is lower than sintered magnet.Bonded permanent magnet because have that cost is low, dimensional accuracy is high, freedom shape is big, mechanical strength is good, light specific gravity, can automated production in enormous quantities continuously, the production efficiency height, advantages such as good product consistency, industry, agricultural, military affairs, science and technology, medical science, life various aspects have been widely used in, the spindle motor of for example a large amount of miniature precision electric motors that use, stepping motor, hard disk drive etc.Wherein, binding rare earth permanent magnet accounts for 94% of total output in the application quantity maximum of rotary device (mainly being the electrical micro-machine that computer is used).The extensive use of bonding rare earth magnet has greatly promoted the growth of its output, is example with bonding NdFeB magnet, and its output just grows at top speed with the speed in every year 35%.
Rare earth permanent magnet is a rubber magnet, also claims flexible bonding rare-earth permanent magnet, is a kind of of bonding rare earth magnet, and this kind magnet has excellent flexibility, bendability, magnetic, cold-resistant and thermal endurance.The NdFeB rubber magnet sheet of commercial thick 1mm can twist on the axle that diameter is 10mm and not ftracture at present, N/D, and the degree of freedom that magnetizes when being used for motor, can effectively reduce the irregular phenomenon of torque than anisotropic magnetic height.The NdFeB rubber magnet can be used for the DC motor on the sound equipment, the magnet that uses under extra small diameter motor, CD, DVD-ROM, DC brushless fan motor, thin flat loud speaker and the harsh conditions.Compare with the rigidity binding rare earth permanent magnet of injection molding forming method preparation with the mold pressing that utilizes of present extensive use, the flexible bonding rare-earth magnet has obvious superiority in the turning motor application scenario, and market potential is very big.
The preparation method of current rigidity of being made by rare earth permanent magnet alloy powder and polymeric material and flexible compound magnet is as follows: at first magnetic is carried out surface treatment, then with surface treated magnetic and polymer by strong mixed, mixing, granulation after, the method for utilizing mold pressing, injection moulding, roll or extruding is made rare earth permanent magnet alloy powder polymer built-up magnet.
As mentioned above, there is following deficiency in the preparation method of existing RE permanent magnetic alloy polymer class magnet: (1) prior art all adopts the magnetic polymer prepared built-up magnet of mixed → mixing → granulation → moulding by force, complex technical process; (2) carry out processing and forming after prior art all adopts rare earth permanent magnet alloy powder and polymer directly mixes, because the difference of alloy magnetic powder and polymer proportion, in order to make two kinds of material mixing even, must carry out Forced Mixing, to equipment of mixing and technological requirement height, be difficult to realize that magnetic mixes with the full and uniform of binding agent; (3) because magnetic is an inorganic matter, binding agent is an organic substance, and both wetabilitys are bad, and the form of mainly utilizing coupling agent to pass through chemical bond between magnetic and the binding agent combines, and bond strength is restricted.
Summary of the invention
Purpose of the present invention is exactly in order to solve above-mentioned the deficiencies in the prior art part, a kind of in-situ polymerization method for preparing of rare earth permanent magnetic alloy polymer composite magnetic body is provided, this method is utilized in-situ polymerization technology, polymer is generated at the magnetic surface in situ, and magnetic polymer mixed and magnet forming process continuous one-step finish, and simplified the preparation technology of built-up magnet.
The present invention is achieved through the following technical solutions: the in-situ polymerization method for preparing of described rare earth permanent magnetic alloy polymer composite magnetic body comprises the steps and process conditions:
The first step, adopt vacuum evaporation technology that stabilization processes is carried out on the rare-earth permanent magnetic alloy magnetic powder surface, in volume parts, the ring disome (C16H16) of 5～10 parts of paraxylene is heated to 650～700 ℃ under vacuum condition, make it be cracked into the monomer vapours of ring disome, to encircle disome steam then is transported to another and is equipped with in 100 parts of rare-earth permanent magnetic alloy magnetic powder containers, ring disome steam is 20～30 ℃ rare-earth permanent magnetic alloy magnetic powder surface deposition and polymerization takes place in temperature, forms one deck parylene film;
In second step, polymer monomer generates polymer in the rare-earth permanent magnetic alloy magnetic powder home position polymerization reaction, and in mass fraction, fine or diphenyl peroxide acetyl joins in 100 parts of polymer monomers with 5～10 parts of azo two isobutyls, makes monomer solution; 90～97 parts of rare-earth permanent magnetic alloy magnetic powders after the adding first step is handled in 3～10 parts of monomer solutions, make suspension system, then suspension system is heated to 65～100 ℃ in nitrogen, be incubated 5～10 hours, make polymer monomer generate polymer in the polymerization of rare-earth permanent magnetic alloy magnetic powder surface in situ;
In the 3rd step, calendering formation after just the magnetic that is coating polymeric binder equably of the generation in second step is directly extruded with twin screw or single screw extruder is prepared described rare earth permanent magnetic alloy polymer composite magnetic body.
Described RE permanent magnetic alloy comprises a kind of among SmCo, SmFeN or the NdFeB.Polymer monomer comprises styrene, methyl methacrylate, acrylic acid butyl ester, methyl methacrylate ethylene oxidic ester in described second step;
As optimal way of the present invention, described second step is, in mass fraction, with 5～10 parts of fine joining in 100 parts of styrene of azo two isobutyls, make styrene solution, in 3～10 parts of solution, add 90～97 parts of rare-earth permanent magnetic alloy magnetic powders then, make suspension system; Again suspension system is heated to 65～80 ℃ in nitrogen, is incubated 5～8 hours, make styrene monomer generate polystyrene in the polymerization of magnetic surface in situ.
Second kind of optimal way of the present invention, described second step is: in mass fraction, 5～10 parts of diphenyl peroxide acetyl are joined in 100 parts of methyl methacrylates, make methyl methacrylate solution; In 3～10 parts of solution, add 90～97 parts of rare-earth permanent magnetic alloy magnetic powders then, make suspension system; Again suspension system is heated to 80～100 ℃ in nitrogen, is incubated 6～10 hours, make methyl methacrylate monomer home position polymerization reaction take place and generate polymethyl methacrylate on the magnetic surface.
The third optimal way of the present invention, described second step is: in mass fraction, with 5～10 parts of fine joining in 100 parts of acrylic acid butyl esters of azo two isobutyls, make the acrylic acid butyl acetate solution, in 3～10 parts of solution, add 90～97 parts of rare-earth permanent magnetic alloy magnetic powders again, make suspension system; Again suspension system is heated to 65～80 ℃ in nitrogen, is incubated 4～6 hours, make acrylic acid butyl ester monomer generate the polypropylene acid butyl ester in the polymerization of magnetic surface in situ.
The 4th kind of optimal way of the present invention, described second step is: in mass fraction, 5～10 parts of diphenyl peroxide acetyl are joined in 100 parts of methyl methacrylate glycidyl ester monomer, make methyl methacrylate glycidyl ester monomer solution, in 3～10 parts of solution, add 90～97 parts of rare-earth permanent magnetic alloy magnetic powders again, make suspension system; Then suspension system is heated to 80～100 ℃ in nitrogen, is incubated 5～7 hours, make the methyl methacrylate glycidyl ester monomer home position polymerization reaction take place and generate the polymethyl methacrylate ethylene oxidic ester on the magnetic surface.
In the present invention, parylene film is a kind of tough and tensile, transparent, polymeric membrane that self lubricity and high uniformity are arranged, and adverse circumstances such as salt fog, mould, cargo sweat are had good barrier propterty.
The present invention compared with prior art has following advantage and beneficial effect:
1, the present invention mixes rare earth permanent magnet alloy powder with polymer monomer, utilize the home position polymerization reaction technology, polymer as binding agent is generated at the magnetic surface in situ, coated equably the polymeric layer on the surface of every magnetic, and after finishing, reaction utilize twin-screw (single screw rod) extruder directly the magnetic binder mixtures to be extruded the back calendering formation, the mixing of magnetic binding agent, magnet moulding are finished continuously, simplified preparation technology.
2, the present invention utilizes the home position polymerization reaction technology, and the polymer as binding agent is generated at the magnetic surface in situ, and the magnetic polymer has guaranteed that in conjunction with firmly magnetic mixes with the full and uniform of binding agent on technology.
3, the present invention utilizes vacuum evaporation technology at the coated parylene film in rare-earth magnetic surface, can make magnetic and external environment isolated fully, makes magnetic have extremely strong anticorrosion and oxidation resistance, thereby fully guarantees the stable of built-up magnet performance.Parylene has good isolating and protecting function to adverse circumstances such as salt fog, humidity, corrosivity.Because Parylene is on the surface of different shape, all can form the ideal uniform overlay comprise in sharp-pointed corner angle, the crack and inner surface etc., thereby be particularly suitable for the surface protection coating of erose rare earth alloy magnet powder.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is done detailed description further, but embodiments of the present invention are not limited thereto.
Embodiment one
In volume parts, the ring disome (C16H16) of 5 parts of paraxylene is heated to 650 ℃ under vacuum condition, make it be cracked into the monomer vapor of ring disome, to encircle disome steam then and be transported to another container by pipeline, making ring disome steam is constantly roll stirring SmCo magnetic surface deposition and polymerization takes place of 20 ℃ be in 100 parts of temperature, forms one deck parylene film.
Afterwards,, in 100 parts of styrene, add 8 parts of azo two isobutyls fine (AIBN) and mix, make styrene monomer solution in mass fraction; In 5 parts of styrene monomer solution, add 95 parts of SmCo magnetics after treatment then, and stir, make mixed system; The gained mixed system is heated to 70 ℃ in nitrogen, is incubated 6 hours, make styrene monomer generate polystyrene in the polymerization of magnetic surface in situ;
Subsequently, directly extrude the back calendering formation, make SmCo magnetic-polystyrene built-up magnet with the magnetic that double screw extruder coats polystyrene.After testing, the density of prepared built-up magnet is 6.06g/cm
3, the maximum magnetic energy product of magnet (BH) max is 24kJ/m
3
Embodiment two
In volume parts, the ring disome (C16H16) of 5 parts of paraxylene is heated to 650 ℃ under vacuum condition, make it be cracked into the monomer vapor of ring disome, to encircle disome steam then and be transported to another container by pipeline, making ring disome steam is that constantly the roll surface aggregate of stirring NdFeB magnetic of 25 ℃ be in forms parylene film 100 parts of temperature; Afterwards,, in 100 parts of methyl methacrylates, add 5 parts diphenyl peroxide acetyl (BPO) and mix, make the methyl methacrylate monomer liquation in mass fraction; The magnetic that adds 90 parts in 10 parts of methyl methacrylate monomer liquations makes suspension system; Again suspension system is heated to 90 ℃ in nitrogen, is incubated 8 hours, make methyl methacrylate monomer home position polymerization reaction take place and generate polymethyl methacrylate on the magnetic surface;
Subsequently, directly extrude the back calendering formation, make NdFeB magnetic-polymethyl methacrylate built-up magnet with the magnetic that single screw extrusion machine coats polymethyl methacrylate.After testing, the density of prepared built-up magnet is 4.20g/cm
3, the maximum magnetic energy product of magnet (BH) max is 30kJ/m
3
Embodiment three
In volume parts, the ring disome (C16H16) of 5 parts of paraxylene is heated to 650 ℃ under vacuum condition, make it be cracked into the monomer vapor of ring disome, to encircle disome steam then and be transported to another container by pipeline, making ring disome steam is the surface aggregate formation parylene film of 28 ℃ the SmFeN magnetic that is in the stirring that constantly rolls 100 parts of temperature; Afterwards,, in 100 parts of acrylic acid butyl esters, add 10 parts azo two isobutyls fine (AIBN) and mix, make acrylic acid butyl ester monomer solution in mass fraction; The magnetic that adds 95 parts in 5 parts of acrylic acid butyl ester monomer liquations makes suspension system; Again suspension system is heated to 75 ℃ in nitrogen, is incubated 5 hours, make acrylic acid butyl ester monomer generate the polypropylene acid butyl ester in the polymerization of magnetic surface in situ;
Subsequently, directly extrude the back calendering formation at 120 ℃ of magnetics that the polypropylene acid butyl ester is coated, make SmFeN magnetic-polypropylene acid butyl ester built-up magnet with double screw extruder.After testing, the density of prepared built-up magnet is 5.15g/cm
3, the maximum magnetic energy product of magnet (BH) max is 32kJ/m
3
Embodiment four
In volume parts, the ring disome (C16H16) of 5 parts of paraxylene is heated to 650 ℃ under vacuum condition, make it be cracked into the monomer vapor of ring disome, to encircle disome steam then and be transported to another container by pipeline, making ring disome steam is the surface aggregate formation parylene film of 22 ℃ the SmCo magnetic that is in the stirring that constantly rolls in temperature;
Afterwards,, in 100 parts of methyl methacrylate glycidyl ester monomer, add 5 parts diphenyl peroxide acetyl (BPO), and stir, make methyl methacrylate glycidyl ester monomer liquation in mass fraction; The magnetic that adds 97 parts in 3 parts of methyl methacrylate glycidyl ester monomer liquations makes suspension system; Mixed system is heated to 100 ℃ in nitrogen, is incubated 7 hours, make the methyl methacrylate glycidyl ester monomer home position polymerization reaction take place and generate the polymethyl methacrylate ethylene oxidic ester on the magnetic surface;
Subsequently, directly extrude the back calendering formation at 130 ℃ of magnetics that the polymethyl methacrylate ethylene oxidic ester is coated, make SmCo magnetic-polymethyl methacrylate ethylene oxidic ester built-up magnet with single screw extrusion machine.After testing, the density of prepared built-up magnet is 5.70g/cm
3, the maximum magnetic energy product of magnet (BH) max is 32kJ/m
3
Embodiment five
In volume parts, the ring disome (C16H16) of 5 parts of paraxylene is heated to 650 ℃ under vacuum condition, make it be cracked into the monomer vapor of ring disome, to encircle disome steam then and be transported to another container by pipeline, making ring disome steam is the surface aggregate formation parylene film of 25 ℃ the NdFeB magnetic that is in the stirring that constantly rolls in temperature;
Afterwards,, in 100 parts of styrene, add 6 parts azo two isobutyls fine (AIBN) and mix, make the styrene liquation in mass fraction; In 3 parts of styrene liquations, add 97 parts magnetic, and stir, make mixed system; Again mixed system is heated to 65 ℃ in nitrogen, is incubated 8 hours, make styrene monomer generate polystyrene in the polymerization of magnetic surface in situ.
Subsequently, directly extrude the back calendering formation, make NdFeB magnetic-polystyrene built-up magnet with the magnetic that double screw extruder coats polystyrene.After testing, the density of prepared built-up magnet is 5.77g/cm
3, the maximum magnetic energy product of magnet (BH) max is 64kJ/m
3
Embodiment six
In volume parts, the ring disome (C16H16) of 5 parts of paraxylene is heated to 650 ℃ under vacuum condition, make it be cracked into the monomer vapor of ring disome, to encircle disome steam then and be transported to another container by pipeline, making ring disome steam is the surface aggregate formation parylene film of 30 ℃ the SmFeN magnetic that is in the stirring that constantly rolls in temperature.
Subsequently,, in 100 parts of methyl methacrylates, add 5 parts diphenyl peroxide acetyl (BPO) and mix, make the methyl methacrylate liquation in mass fraction; The magnetic that adds 90 parts in 10 parts of methyl methacrylate liquations makes suspension system; Again suspension system is heated to 100 ℃ in nitrogen, is incubated 6 hours, make methyl methacrylate monomer home position polymerization reaction take place and generate polymethyl methacrylate on the magnetic surface.
Afterwards, directly extrude the back calendering formation, make NdFeB magnetic-polymethyl methacrylate built-up magnet with the magnetic that single screw extrusion machine coats polymethyl methacrylate.After testing, the density of prepared built-up magnet is 4.35g/cm
3, the maximum magnetic energy product of magnet (BH) max is 20kJ/m
3
Embodiment seven
In volume parts, the ring disome (C16H16) of 5 parts of paraxylene is heated to 650 ℃ under vacuum condition, make it be cracked into the monomer vapor of ring disome, to encircle disome steam then and be transported to another container by pipeline, making ring disome steam is the surface aggregate formation parylene film of 23 ℃ the SmFeN magnetic that is in the stirring that constantly rolls in temperature.
Afterwards,, in 100 parts of styrene, add 8 parts azo two isobutyls fine (AIBN) and mix, make the styrene liquation in mass fraction; In 3 parts of styrene liquations, add 97 parts magnetic, and stir, make mixed system; Again mixed system is heated to 80 ℃ in nitrogen, is incubated 5 hours, make styrene monomer generate polystyrene in the polymerization of magnetic surface in situ.
Subsequently, directly extrude the back calendering formation, make SmFeN magnetic-polystyrene built-up magnet with the magnetic that double screw extruder coats polystyrene.After testing, the density of prepared built-up magnet is 5.70g/cm
3, the maximum magnetic energy product of magnet (BH) max is 42kJ/m
3
Embodiment eight
In volume parts, the ring disome (C16H16) of 5 parts of paraxylene is heated to 650 ℃ under vacuum condition, make it be cracked into the monomer vapor of ring disome, to encircle disome steam then and be transported to another container by pipeline, making ring disome steam is the surface aggregate formation parylene film of 20 ℃ the NdFeB magnetic that is in the stirring that constantly rolls in temperature.
Afterwards,, in 100 parts of acrylic acid butyl esters, add 7 parts azo two isobutyls fine (AIBN) and fully stirring, mix, make acrylic acid butyl ester liquation in mass fraction; The magnetic that adds 95 parts in 5 parts of acrylic acid butyl ester liquations makes suspension system; Again suspension system is heated to 80 ℃ in nitrogen, is incubated 4 hours, make acrylic acid butyl ester monomer generate the polypropylene acid butyl ester in the polymerization of magnetic surface in situ;
Subsequently, directly extrude the back calendering formation at 120 ℃ of magnetics that the polypropylene acid butyl ester is coated, make NdFeB magnetic-polypropylene acid butyl ester built-up magnet with single screw extrusion machine.After testing, the density of prepared built-up magnet is 5.25g/cm
3, the maximum magnetic energy product of magnet (BH) max is 48kJ/m
3
Embodiment nine
In volume parts, the ring disome (C16H16) of 5 parts of paraxylene is heated to 650 ℃ under vacuum condition, make it be cracked into the monomer vapor of ring disome, to encircle disome steam then and be transported to another container by pipeline, making ring disome steam is the surface aggregate formation parylene film of 25 ℃ the SmCo magnetic that is in the stirring that constantly rolls in temperature.
Afterwards,, in 100 parts of methyl methacrylates, add 10 parts diphenyl peroxide acetyl (BPO) and mix, make the methyl methacrylate liquation in mass fraction; The magnetic that adds 90 parts in 10 parts of methyl methacrylate liquations makes suspension system; Again suspension system is heated to 80 ℃ in nitrogen, is incubated 10 hours, make methyl methacrylate monomer home position polymerization reaction take place and generate polymethyl methacrylate on the magnetic surface.
Subsequently, directly extrude the back calendering formation, make SmCo magnetic-polymethyl methacrylate built-up magnet with the magnetic that double screw extruder coats polymethyl methacrylate.After testing, the density of prepared built-up magnet is 4.86g/cm
3, the maximum magnetic energy product of magnet (BH) max is 12kJ/m
3
Embodiment ten
In volume parts, the ring disome (C16H16) of 5 parts of paraxylene is heated to 650 ℃ under vacuum condition, make it be cracked into the monomer vapor of ring disome, to encircle disome steam then and be transported to another container by pipeline, making ring disome steam is the surface aggregate formation parylene film of 27 ℃ the SmCo magnetic that is in the stirring that constantly rolls in temperature.
Afterwards,, in 100 parts of acrylic acid butyl esters, add 8 parts azo two isobutyls fine (AIBN) and fully stirring, mix, make acrylic acid butyl ester liquation in mass fraction; The magnetic that adds 95 parts in 5 parts of acrylic acid butyl ester liquations makes suspension system; Again suspension system is heated to 65 ℃ in nitrogen, is incubated 6 hours, make acrylic acid butyl ester monomer generate the polypropylene acid butyl ester in the polymerization of magnetic surface in situ.
Subsequently, directly extrude the back calendering formation at 120 ℃ of magnetics that the polypropylene acid butyl ester is coated, make SmCo magnetic-polypropylene acid butyl ester built-up magnet with single screw extrusion machine.After testing, the density of prepared built-up magnet is 6.06g/cm
3, the maximum magnetic energy product of magnet (BH) max is 24kJ/m
3
Embodiment 11
In volume parts, the ring disome (C16H16) of 5 parts of paraxylene is heated to 650 ℃ under vacuum condition, make it be cracked into the monomer vapor of ring disome, to encircle disome steam then and be transported to another container by pipeline, making ring disome steam is the surface aggregate formation parylene film of 30 ℃ the NdFeB magnetic that is in the stirring that constantly rolls in temperature.
Afterwards,, in 100 parts of methyl methacrylate glycidyl ester monomer, add 6 parts diphenyl peroxide acetyl (BPO), and stir, make methyl methacrylate ethylene oxidic ester liquation in mass fraction; In 5 parts of methyl methacrylate ethylene oxidic ester liquations, add the magnetic of 95 parts of mass percents, make suspension system; Again mixed system is heated to 80 ℃ in nitrogen, is incubated 5 hours, make the methyl methacrylate glycidyl ester monomer home position polymerization reaction take place and generate the polymethyl methacrylate ethylene oxidic ester on the magnetic surface.
Subsequently, directly extrude the back calendering formation at 130 ℃ of magnetics that the polymethyl methacrylate ethylene oxidic ester is coated, make NdFeB magnetic-polymethyl methacrylate ethylene oxidic ester built-up magnet with double screw extruder.After testing, the density of prepared built-up magnet is 5.25g/cm
3, the maximum magnetic energy product of magnet (BH) max is 48kJ/m
3
Claims (7)
1, rare earth permanent magnetic alloy polymer composite magnetic body in-situ polymerization method for preparing is characterized in that comprising the steps and process conditions:
The first step, adopt vacuum evaporation technology that stabilization processes is carried out on the rare-earth permanent magnetic alloy magnetic powder surface, in volume parts, the ring disome (C16H16) of 5～10 parts of paraxylene is heated to 650～700 ℃ under vacuum condition, make it be cracked into the monomer vapours of ring disome, to encircle disome steam then is transported to another and is equipped with in 100 parts of rare-earth permanent magnetic alloy magnetic powder containers, ring disome steam is 20～30 ℃ rare-earth permanent magnetic alloy magnetic powder surface deposition and polymerization takes place in temperature, forms one deck parylene film;
In second step, polymer monomer generates polymer in the rare-earth permanent magnetic alloy magnetic powder home position polymerization reaction, and in mass fraction, fine or diphenyl peroxide acetyl joins in 100 parts of polymer monomers with 5～10 parts of azo two isobutyls, makes monomer solution; 90～97 parts of rare-earth permanent magnetic alloy magnetic powders after the adding first step is handled in 3～10 parts of monomer solutions, make suspension system, then suspension system is heated to 65～100 ℃ in nitrogen, be incubated 5～10 hours, make polymer monomer generate polymer in the polymerization of rare-earth permanent magnetic alloy magnetic powder surface in situ;
The 3rd step, directly extrude the back calendering formation with the magnetic that is coating polymeric binder equably that twin screw or single screw extruder generated for second step, prepare described rare earth permanent magnetic alloy polymer composite magnetic body.
2, according to the described rare earth permanent magnetic alloy polymer composite magnetic body in-situ polymerization method for preparing of claim 1, it is characterized in that: described RE permanent magnetic alloy comprises a kind of among SmCo, SmFeN or the NdFeB.
3, according to the described rare earth permanent magnetic alloy polymer composite magnetic body in-situ polymerization method for preparing of claim 1, it is characterized in that: described polymer monomer comprises a kind of in styrene, methyl methacrylate, acrylic acid butyl ester or the methyl methacrylate ethylene oxidic ester.
4, according to the described rare earth permanent magnetic alloy polymer composite magnetic body in-situ polymerization method for preparing of claim 1, it is characterized in that described second the step be: in mass fraction, with 5～10 parts of fine joining in 100 parts of styrene of azo two isobutyls, make styrene solution, in 3～10 parts of solution, add 90～97 parts of rare-earth permanent magnetic alloy magnetic powders then, make suspension system; Again suspension system is heated to 65～80 ℃ in nitrogen, is incubated 5～8 hours, make styrene monomer generate polystyrene in the polymerization of magnetic surface in situ.
5, according to the described rare earth permanent magnetic alloy polymer composite magnetic body in-situ polymerization method for preparing of claim 1, it is characterized in that described second the step be: in mass fraction, 5～10 parts of diphenyl peroxide acetyl are joined in 100 parts of methyl methacrylates, make methyl methacrylate solution; In 3～10 parts of solution, add 90～97 parts of rare-earth permanent magnetic alloy magnetic powders then, make suspension system; Again suspension system is heated to 80～100 ℃ in nitrogen, is incubated 6～10 hours, make methyl methacrylate monomer home position polymerization reaction take place and generate polymethyl methacrylate on the magnetic surface.
6, according to the described rare earth permanent magnetic alloy polymer composite magnetic body in-situ polymerization method for preparing of claim 1, it is characterized in that described second the step be: in mass fraction, with 5～10 parts of fine joining in 100 parts of acrylic acid butyl esters of azo two isobutyls, make the acrylic acid butyl acetate solution, in 3～10 parts of solution, add 90～97 parts of rare-earth permanent magnetic alloy magnetic powders again, make suspension system; Again suspension system is heated to 65～80 ℃ in nitrogen, is incubated 4～6 hours, make acrylic acid butyl ester monomer generate the polypropylene acid butyl ester in the polymerization of magnetic surface in situ.
7, according to the described rare earth permanent magnetic alloy polymer composite magnetic body in-situ polymerization method for preparing of claim 1, it is characterized in that described second the step be: in mass fraction, 5～10 parts of diphenyl peroxide acetyl are joined in 100 parts of methyl methacrylate glycidyl ester monomer, make methyl methacrylate glycidyl ester monomer solution, in 3～10 parts of solution, add 90～97 parts of rare-earth permanent magnetic alloy magnetic powders again, make suspension system; Then suspension system is heated to 80～100 ℃ in nitrogen, is incubated 5～7 hours, make the methyl methacrylate glycidyl ester monomer home position polymerization reaction take place and generate the polymethyl methacrylate ethylene oxidic ester on the magnetic surface.
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| CN1381600A (en) * | 2002-02-22 | 2002-11-27 | 清华大学 | Process for preparing permanent-magnet rare-earth powder from regenerated permananent-magnet rare-earth material |
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